When I go on an overseas trip, how long do I have to go to Incheon Airport before I get on the plane?

I'm planning to go to Incheon Airport when I travel abroad.

Of course, I know it's good to go early, but it's early in the morning, so I'd like to go out when I have some time.

How long do I have to go before I get on the plane?

825 2017-07-13 Gentleman

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